finished

src/BankAccount.java

+public class BankAccount {
+    public int accountNumber;
+    public String name;
+    public double balance;
+    public double overdraft;
+    
+    BankAccount(int x,String y,double z) {
+        accountNumber= x;
+        name=y;
+        balance=z;
+        overdraft=0;
+    }
+    
+
+    public void desposit(int i) {
+        balance = i + balance;
+    } 
+    public double display() {
+        return balance;
+    }
+
+    public void setbal(int i) {
+        balance=i;
+    }
+
+    public void withdrawl(int i) {
+         double temp =this.balance-i;
+         if (this.overdraft<0)
+         {
+             if (temp>this.overdraft)
+              {
+                this.balance = this.balance - i;
+             }
+         }
+         else
+         {
+             this.balance=this.balance-i;
+         }
+        }
+
+    public void bankFees() {
+        double temp= 0.05 * this.balance;
+        this.balance=this.balance-temp;
+    }
+
+    public void addOverdraft(int x) {
+        x=0-x;
+        this.overdraft=x;
+        
+    }
+    public double thisover() {
+        return overdraft;
+    }
+    
+}

src/Standard_Account.java → src/SavingAccount.java

-public class Standard_Account {
+public class SavingAccount {
     public int accountNumber;
     public String name;
     public double balance;
     
+    SavingAccount() {}
+    
+    SavingAccount(int x,String y,double z) {
+        accountNumber= x;
+        name=y;
+        balance=z;
+    }
+        
     
     public void desposit(int i) {
         balance = i + balance;
@@ -18,4 +26,10 @@ public class Standard_Account {
     public void withdrawl(int i) {
         balance = balance - i;
     }
+    
+    public void accrueInterest() {
+        double temp= 0.05 * this.balance;
+        this.balance=this.balance+temp;
+    }
 }
+    

src/main.java

 public class main {
     public static void main(String[] args) throws Exception {
-        BankAccount bank = new BankAccount();
-        bank.setbal(5);
+        BankAccount bank = new BankAccount(111,"bob",10);
+        bank.addOverdraft(15);
+        System.out.println(bank.thisover());
         System.out.println(bank.display());
+        bank.withdrawl(9);
+        System.out.println(bank.display());
+        bank.withdrawl(100);
+        System.out.println(bank.display());
+        
         }
     }
-